package com.ktjiaoyu.crm.filter;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

public class AuthorizationFilter implements Filter  {
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest httpRequest = (HttpServletRequest)request;
        HttpServletResponse httpResponse = (HttpServletResponse) response;
        if (httpRequest.getSession().getAttribute("loginUser")==null){
            httpResponse.setContentType("text/html;charset=UTF-8");
            PrintWriter out = httpResponse.getWriter();
            out.print("<script>" +
                    "alert('请先进行登录，再进行后续操作！（Filter控制）';" +
                    "location.href='"+httpRequest.getContextPath()+"/login.jsp';" +
                    "</script>");
        }else {
            chain.doFilter(httpRequest,httpResponse);
        }
    }

    @Override
    public void destroy() {

    }
}
